Burnout Paradise on PC ...Power supply get hot!

Yaar i m having a cooler master 600 watt power supply but after playing half an hour my power get hotter n hotter ........ n some odd smell also came from power supply .tell me wht type of problem i havve

Inadequate air flow.

Do you have a UPS or a stabilizer?

Do you overclock often?

Is the electricity point (switch) giving adequate power?

What are your System specs?